Refrigerating apparatus.



H. H. SOUTHWQRTH s. F. w. woLF.

REFBIGERATING APPARATUS.

APPLICATION msu ocr. 23, 1912.

.'lgg@ Patented May 11, 1915.

6 SHEETS-SHEET l.

H. H. SOUTHWORTH & F. W. WOLF.

REFRIGERATING APPARATUS.

APPLICATION FILED OCT. 23, 19l2.

H. H. SOUTHWORTH & F. W. WOLF.

REFRIGERATING APPARATUS.

APPLICATION FILED ocT. 23, 1912.

lgl. Patented- May I1, 1915.

6 SHEETS-SHEET 3.

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H. H. SOUTHWORTH I F. W. WOLF.

REFRIGERATING APPARATUS.

APPLICATION FILED ocT.23 1912.

l @LQQO v Patented May M, 19M.

6 SHEETS-SHEET 4.

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7 Ill mgm l 'I A H. H. SOUTHWOHTH (IL F. W. WOLF.

REFRIGERATING APPARATUS.

APPucATloN FILED ocT.23. 1912.

LQ Patente Many 11, 1915.

6 SHEETS-SHEET 5.

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f f j @of H. H. SOUTHWORTH & F. W. WOLF.

REFRIGERATING APPARATUS.

APPLlcAmN man ocr. 23. 1912.

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ff; M .Y f l HARRISON H. SOUTHWORT-I, F CLEVELAND, HIO, ANDEFBIEQD Vf.l VUOLE, 0F CHCAGG, ILLINUIS, ASSIGNORS, BY MES-NE ASSIGNMENTS, T0 'XE-E ICELESS MACHINE G01/a- PANY, 0F CLEVELAND, OHIO, A CORPORATION 0F OHM?.

REFRIGERATING APPARATUS.

nisaaso.

Specicaton of Letters Patent.

Patented Mey im T3515 Application led October 23, 1912. Serial No. 527,353.

To all whom it may concern Be it known that we, HARRISON H. SOUTH- woRTH and FRED W. l/Vonr, citizens of the nited States, and residents, respectively, of Cleveland, in the county of Cuyahoga and State of Ohio, and of Chicago, in the county of Cook and State of illinois, have invented certain new and useful lniprovements in Refrigerating Apparatus; and we do hereby declare that the following is a full, clear, and eXact description thereof, reference being had to the accompanying drawings, and to the letters of reference niarlied thereon, which forni a part of this specification.

rihis invention relates to improvements in refrigerating apparatus and consists of the inatters hereinafter described and more particularly pointed out in the appended claims.

The improvements embraced in the present invention are shown herein as applied to the type of refrigerating apparatus described in applications heretofore led by us on the 1st day of ll/larch, 1911, Serial No. ($111,560 and on the 29th day. ci January, 1912, Serial No. 673,972.

in the drawings l'd`iguie 1 is a View representing a top plan of a refrigeration apparatus ofthe type described provided with our iinproveinents. Fig. 2 is a view of the apparatus in side elevation with the side wall of the tanl; and oic the inclosing casing shove the tanlr broken away. Fig. 8 is a view on an enlarged scale representing a 'front elevation of the upper part of the apparatus. Fig. i is a view on a like scale representing a rear end elevation of the upper part ci' the apparatus. Fig. 5 is a view representing a partial transverse section in a plane indicated by the line 5-5 ci' Fig. .2, the scale being the saine as that in Figs. 3 and Li. Fig. 6 is a view representing a partial transverse section or" the part of the apparatus shown in Fig. 3, in a plane indicated hy the line 6-6 of Fig. 3. l? ig. 7 a view iresenting a partial transverse tion through the apparatus shown in Fig. a plane indicated by the line 7 7 of e. Figs. 8 and 9 are views in rear end ot a part of the apparatus shown showing the mechanism in diferr Aatio. s to loe more particularly rered to later. Fig. 10 is a view representeilt" if:

part shown in ig. 4, in a plane indicated by the line 10-10 of Fig. e. F 11N is a view representing a vertical central section through one of the diaphragm operated. y valves embraced 4in the apparatus. Fig.l 12

ing a vertical section through the part shown in Fig. 7, in a plane indica-ted icyA the line 13--13` of Fig.

Referring now to the drawings, 1Q inldi- Cates a tank .which forms Athe hase of. the apparatus and which is adapted for containing cooling `water for cooling the liquid' rnonia condensing and receiving coils 11 which are contained within it.

12, 13 indicate parallel, longitudinally extending, elongated nietal drums, which constitute the generator absorbers adap'ed for containing aqua amnionia'and which are cooled and heated in alternation the cperation 'of the apparatus. The said drains are inclosed hy a metal casing 14C having inclined side walls 14a, 14a, and upright and rear Walls 14h, 1&9 which rest upon' and are secured to the upper edges of the walls of the tank 10. The drums are separated hy a partition 15 which is spaced midway he- Atween them and extends the full ler 'f the casing 14e with its ends secured to. tr walls lib, 141 of said casing.

11i@ indicates the top wall o' the To the top ciz each druni its forward end is secured a. pipe 16 for 'the discl'iarge ci" the arnnionia gas distilled frein said drum. Said pipe 16 rises shortly ahove the level of the drum to which it is attached, crossesover by rneans oin4 an upwardly inclined branch pipe 16 which throng the dividing wall i5) to a point in the vei plane through the central axis or" the jacent druniand has an upwardly and rearwardly inclined branch 16h. Said branch pipe 16D has connection. at its end w.' a Vforwardly and upwardly inclined lira pipe 16C, the being connected. at rear ends by pend 16d attached foy a isop or strap 17 to the rear wali 1e'D of the u casing Thehranch pipes 1Gb and cc stitute rect-"2 the distined Aironia is r each le cated in thev vertical plane extending through the longitudinal central axis of the drum or generator-absorber adjacent to the one with which they are connected.

Above each pair of branch-pipes 16b and 16c and in the vertical plane thereof, is located a water-pipe 18, the same, as shown in the drawings, being supported upon the upper branch pipe 16 by means of straps 18a, 18a. Upon the rear ends of the water pipes 18 and extending between them is a' box 19 having a longitudinally extending partition 19a located in a plane half way between the plane of the water pipes 18 and dividing said box into two compartments. Each compartment has a bottom wall 19b that is nclined downwardly from said partition ltoward the associated water-pipe 18. Said bottom wall 19b has a slot 19c (see Fig. 5) which opens into the top of the associated water-pipe 18. Each pipe 18 in its length beyond the box 19 has a plurality of longitudinally spacedperforations 18b on its top side. Thus water discharged into one of the compartments of the box 19 upon the inclined bottom thereof will iow into and lill one 'of the pipes 18 throughout its length and from said pipe will flow through the perforations 18b and fall upon the branch pipeslb, 16C, .constituting the rectifiers, and then fall upon the associated tank 12 or 13 below it.

Water is discharged into the box 19 from a flexible pipe or tube 20 connected to any suitable source ofwater supply (not shown) having a nozzle 2Oa which is engaged by a fork 21 at the`upper end of a lever 21u. Said lever is pivotally mounted on a stud 21b on therear end wall 14b ofthe upper casing, so as to be capable of an oscillating movement in a vertical plane to swing the nozzle 2()a from a position above one compartment of the boxl 19 to a position abovev the other compartment. Said lever is oscillated by mechanism and in a way presently to be described.

Below the drums is located a burner 22 which isV adapted to be swung from a position below one drum to a position below the other drum. Said burner comprises a longitudinally extending pipe 23, closed at its rear end, and Arotatively mounted inthe end walls 14b of the casing 14 and constituting a rock-shaft on which the burner is adapted to be rocked; and a longitudinally extending pipe 24 vertically spaced from and parallel to the first named pipe 23 and connect- ,ed to said pipeby means of longitudinally spaced pipes 25. The pipe 24 is of substantially the length of the drums 12, 13, is closed at both ends, and is provided with burner openings 24a so placed in the pipe that when the pipe 24 is under one of the drums, the'flame will be directed against said drum.

walls 26", 26b to each of which is rigidly connected one of the arms 26a. These troughs are so proportioned and positioned with reference tothe burner pipe 24 that they may be swung into a posit/ion under the drums and into a position removedfrom thel drum without striking said drums in their movement, as shown in Fig. 5, and so thatt their side walls will partially embrace theV curved walls of the drums when they are'in position under the' drums.

Fuel gas isadmitted to the rock-shaft pipe 23 of the burner through an adjustable mixing valve 27 of familiar type, adapted for supplying the proper mixture of air and gas. (Said valve is shown in section in Fig. 12.) A pipe 32 connects the casing 29 of the mixing valve with a second valve casing, 33, which, as shown, is spherical and has formed within it a partition wall 33 separating the casing int two compatments. Said partition is provided with a valve opening having a seat 33b against which is adapted to seat'a valve disk 34. Said valve disk has a stem 34x that extends diametrically of the valve casing at right angles to the partition wall .33a and has reciprocable bearing in said casing. One end of said valve stem projects outside of the casing. The pipe 32 leading to the mixing valve casing 29 opens into one compartment of the casing 33, while a main fuel gas supply pipe 37 opens into the other compartment. The valve disk 34 is normally held closed on its seat by a coiled spring 34a which bears between the rear face of said valve disk and the inner wall of the casing. The valve disk 34 is provided with an aperture 34b ofsmall diameter which provides for a continuous passage of a small amount of fuel vgas to provide a pilot iame when the valve disk is closed.

Each of the upper branches 16c of the rectifier pipe are provided with check-valves 16? adapted to prevent the return flow of ammonia gas therethrough and are then extended beyond the front wall 14b of the upper casing 14, where they are connected by T-iittings 40 with upright pipes 41 that communicate with positively operating automatic check-valve structures 42 that will be more particularly described later. Each of said check-valve structures 42 is connected by suitable fittings to a common pipe 43 leading to an uj rightpipel 44 which is conneclted with the condensing and receiving coi 11.

`for all.

the valves 48 which is interposed betvveenA In the bottom of each drum 12 and 13 is located a perforated pipe that may be termed a suction pipe, Whichis closed at its inner end and which projects through the front end of the drum and through the front wall 14b ofthe upper casing. Beyond said wall it is provided with a check-valve 46 that is adapted to prevent a return flow from the drum through said check-valve. Beyond the check-valve 46 is a connection 47 which leads into a positively acting automatic check-valve structure 48 which is also adapted to prevent a return ovv from the drum. This latter valve structure is con` nected by a pipe 49 with a trap 50 adapted to arrest any liquor which may leak through the check-valve when the associated generator-absorber is being heated, the same being preferably of the construction described in the application heretofore referred to, Serial Number 67 3,97 2. Said trap 4is connected by a branch pipe 51 with a main return pipe 5 2 which leads from the refrigerating coils and is adapted for the return of the eX- panded ammonia gas to that oneof the two generator-absorbers which is absorbing.

Each of the four positively operating automatic check-valves 48, 48, and 42, 42 are alike, so that. a description of one will suffice We shall therefore describe one of one of the return branch pipes 49 of the return system, and the pipe 47 connected by the check-valve 46 with the suction pipe 45. Said valve (see Fig. 11) has a tubular casing 53 which is connected at its lower end by a suitable coupling 53at to the pipe 49. In the'lower end of said casing is securedv a tubular valve plug 54 provided at its upper end with a knife-edge valve seat 54a for a ball 55. Above the level of said valve seat 54a the pipe 47 opens into and is connected to the casing 53 by meansv of a nipple 56. Thus normally fluid may flow from the pipe 49 to the pipe 47 by lifting the ball 55, while the return of fluid in the opposite direction from the pipe 47 to the pipe 49 is prevented by the Weight of the ball which normally gravitates to its seat.

Mechanism is provided for positively holding the ball 55 on itsseat as follows: Above the pipe 47 'the casing 53 is provided with a partition wall 57 having an aperture through which projects a vertical stem 58 that is adapted to engage the ball 55, but which is normally held from such engagement. To the upper end of the casing 53 is secured a sleeve 59 having a recessed, annular Harige 59a. 60 indicates a diaphragm preferably made of thin metal, bearing upon a plate or flange 58CL fixed to the upper end of the stem 58. Said diaphragm is held in place against the flange 59a of the sleeve 59 by an annular cap 61 having aninternally threaded flange which is screwed upon the below the valve seat.

threaded annular edge of the flange 59a. Said cap 61 isprovided with a recess 62 to form a chamber above the diaphragm and has a threaded apertured nipple 63 by which it is connected to a pipe 64. rlhe flange 59a is provided with an aperture 59b which opens into the space below the diaphragm 60 so as to provide atmospheric pressure on the underside of said diaphragm.

66 indicates a packing sleeve, preferably of soft rubber, which surrounds the stem 58 and is interposed between said stem and the walls of the casing 53 above the partition wall 57 therein. Above and l-beloW said packing sleeve are located metal washers 66a, 66h. A spring 67 coiled about the stem 58 is interposed between the top Washer 66al and the flange 58avat the top of the stem. Said spring normally holds the stein 58 from con- .tact with the ball 55 and maintains the-packvalve 48 in the ammonia gasreturn conduit of each drum is connected to a pipe 70 (see Fig. 8) Which is connected at its upper end tothe pipe 64 entering the diaphragm of the positively acting check-valve 42 in the ammonia gas discharge conduit of the other drum. rEhe pipes 70 have connection at their lower ends with horizontal pipes 71, 71 spaced at each side of the partition 15 between the drums 12 and 13 and located slightly above the level of the arcuate plane in which the burner tube 24 of the burner rotates. The rear ends of the pipes 71 are closed, and. the pipes 71, 70 and 64 are filled with a. thermostatic fluid adapted, under a predetermined temperature, to expand the fluid and exert sufficient pressure on the diaphragme 60 to overcome the upward action of the springs 67 in the valve casings 53 and bring the stems 58 down against the balls 55 and hold the same closely adjacent their seats.

The tubular valve plugs 54 are preferably made of case-hardened steel the valve seats on said plugs are made sharp as described so that when scale or other solid matter is caught between the ball and its seat, the pressure exerted by the stem 58 when it bears on the ball, will cut such scale or solid matter, which will'then fall or drop The valve is thus self cleaning.

78, 73 indicate bypass pipes connecting into the -the part of the discharge conduit intermeany other source, leaks back through the check-valves 4'2 and passes in a contrary direction therethrough, will take the path of leastl resistance down through the pipe 73 pipe 47, and thence through the check-valve 46 will pass into the connected suction pipe, whence it will escape below the surface of the aqua ammonia therein by which it will be absorbed.

As shown herein, the burner 22 and the water discharge nozzle 20a, comprising the heating and cooling means, are shifted to simultaneously heat and cool the two drums inl alternation by means as follows: In each 'drum is located a pipe 75 containing a thermostatic fluid (see Figs. 2 and 5) which pipe is closed at its front end and projects through the rearend of the drum and beyond the rear end wall of the upper casing where it is connected to a casing 7 6 containing a diaphragm adapted, under pressure developed in the pipe 75 and the casing 76, to depress a stem 77. 78 indicates horizontal levers fulcrumed on lugs 78a fixed to the casings 76 and each having a short arm adapted for engagement bythe stem 77 mounted in the associated casing. The longer arms of said levers are each connected by links 79 to levers 80 located below the levers 78 and fulcrumed on the rear end walls 1-4b of the casing 14. The levers 8O project toward each other beyond their connection with the respective -linlrs 79 and are provided at their ends with laterally projecting lugs 8O2A which are adapted for engagement against radial shoulders 81, 81, on anarcuate plate 82 carried by a rock-arm 83 fixed to the rear end of the rock-shaft pipe 23 of the burner 22.' rlhe construction is such that the lugs 80L on the levers 80, unless otherwise restrained, will normally hang in the arcuate path of the said shoulders 81 on the arcuate plate 82.

The diaphragm casings 736 are supported on a horizontal pla-te 84 having flanges 84a, 84a, bolted to the upright rear wall 14h of the casing 14. Levers 85, 85 are fulcrumed on lugs 85a, 85a, fixed to said plates 84 and, projecting rearwardly in a horizontal. direction from theA rear wall 14b of the upper casing, carry Weights 87 at their outer ends.

suspended by suitable links 86. Each of said levers 85 is connected by a link 88 with one of the levers 78. 1t is thus necessary that sufficient pressure he developed in the diaphragm casingsYG to depress the stems T7 with such forceas to lift, not only the weight ofthe operating parts, but also the weights suspended at the ends of the levers 85, before the levers 78 will be operated to raise their associated levers 80 from the arc- `uate path of the shoulders 81 on the arcuate plate 82. The weights are carefully determined so as to prevent this-operation of the parts'until the temperature inthe generator-absorber which is being heated, has risen to a predetermined point corresponding with the weakness of liquor with which the apparatus is designed to work.

Connected to the return-pipe 52 leading back to the generator-absorber from the refrigerator coil, is an upright pipe 90 which communicates with a casing 91 at the upper end of which is provi-ded a diaphragm vcasl ing 92. The diaphragm casing contains a diaphragm 98 adapted to operate a stein 94 which engages against a horizontal lever 95 that is pivoted to a lug 95L rising from the diaphragm casing. The diaphragm casing 92 is rigidly connected to and supported at the end of the plates 84 intermediate the other two diaphragm casings 76 and spaced outwardly therefrom.

964 indicates a link connected to the lever 95 beyond the diaphragm casing 92 and depending through an aperture in the plate 84. Said linl: 96 is provided at its end with a fixed part or nut 96a located below said plate 84. A coiled spring 97 is interposed between said nut and the under face of the plate 84. The tension of this spring is carefully predetermined to correspond to the pressure to be attained in the generator-absorber that is absorbing, indicating the lpredetermined degree of 'saturation at which the apparatus is designed to work. Thus the pressure acting against the diaphragm 98 will have no effect to raise the lever 95 until this predetermined pressure in the generator-absorber that is absorbing has been reached.

Fulcrumed in a vertical plane adjacent to one of the levers 80, is a lever 98 Which is preferably pivoted on the same stud as the' said lever 80 and which carries at its end a lug 98L1 normally adapted to stand in the arcuate path of shoulders 99, 99, formed on the arcuate plate 82, in a plane adjacent to the other shoulders 81, 81 thereof. Said shoulders 99 are spaced each side of the median radius of said arcuate plate and are each lO- cated intermediate one of the shoulders 81 and said median radius. The lever 95 that is operated by the diaphragm 93 is extended into the vertical plane of the lever 98 and carries at its end a hooked linlr 95X which engages in an aperture in said lever 98 near Lits end, so that the upward movement of the vlever 95 under the action of the diaphragm acts to lift the lever 98 and thus raise the lug 98L carried at its end out of the path of the stops or shoulders 99, 99.

The movement of the burner 22 is limited in either direction bystops or pins 83"' (see Fig. 4) fixed to the rear end wall of the upper casing in a position to be struck by the arm 83 on the burner when the burner comes to heating position under either of the drums. To prevent jarring when the burner 22 is stopped in said position, it is provided with an arm 83"L (secured to it as shown, adjacent to the arm 83). which arm is connected by a link 110 with the piston 111of a dash-pot 112. (See Figs. 2 and 4.)

The water discharge nozzle 21 is shifted with the burner 22, but in the opposite direction. As shown, the lever 21a which shifts it has a fork at its lower end which engages a pin 21 on the burner arm 83' so that the shifting movement of the burner will cause a shifting movement of the nozzle 20a.

At the forward end of the rock-shaft pipe 23 of the burner 22 (see Figs. 3, 6 and12) there is secured a rock-arm 100 carrying an arcuate plate 101 located in a plane adjacent to the end of the valve stem 34X which operates the valve disk 34 in the fuel gas supply valve casing 33. Said plate 101 carries at its ends spring-shoes 101, V101 (which, as shown, are made in one piece) and which are adapted when swung into a position in line with sai d valve stem 34X to strike the same and move it longitudinally inward against the action of the v coiled spring 34a and thus move the valve'fdisk'34 vfrom its seat. The said spring-shoes and the arm 100 carrying them, are so arranged with reference to the burner 22, that one' or the other of them will be in operative evngagement with said stem 34X so as to hold the valve open, when the burner is in heating position under one or the other drums 12, 13.

As in the case of the second above referred to application, a thermostatic device is provided in thev common ammonia discharge pipe 44y which leads to the receiving coil, to turn down the gas in case the temperature of the ammonia gas delivered from the rectifier pipe is higher than a certain degree in'- dicating that generation is taking place too rapidly for the ammonia gas tobecome thoroughly dehydrated in passage through the rectiiier pipe. 102 indicates this thermostatic device. (See Fig. The same comprises a diaphragm casing containing a diaphragm as before?. 103 indicates a lever adapted to be operated by said diaphragm and to be raised when thecertain temperature above referred to has been reached. by the ammonia gas passing through the Vpipe 44. The raising of the lever prior to this time is prevented by a coiled spring 103a the tension of which is carefully predetermined. T his thermostatic arrangement 'thus far referred to requires no further description to and forms no part of the present,

' invention.

On the valve casing 33 is pivotally mounted a bell-crank lever 104 which is adapted to swing in the vertical plane containing the valve stem 34 and which has la vertical arm 104% provided with a fork 1041, which straddles the projecting end of the valve stern and is located between the casing and the path of the spring-shoes 1013, 10P. The horizontal arm 104'3 of said bell-crank lever isV connected by along link 105 with the leverv 103 that is operated by the thermostatic device 102.

When the arm 1 0'0 is in position so that one of the spri-ngshoes 101a holds thel valvestem 34X with the valve disk 34 awayfv from.. its seat, whichv is its position when the burner is in heating positionunder one of the drums, the fork 1,04b liesclose against the valve casing,"and permits the full intended opening of the valve'. Should, however, the temperature' of the ammonia gas passing through lthe common discharge pipe 44 rise above the certain point referred to, the thermostatic device'will cause the lever 103 to rise and this willA produce an upward movement of the horizontal arm of the bell-crank lever 104. rlhis will cause the vertical arm of said lever to move outwardly away from the valve casing 33 and push the spring- `shoe 101a away from the valve stem 34X,

whereupon the valve disk 34, under the pressure ofthe coiled spring 34a', will move toward its seat and close or partially close thereon. This will cut down the ligas `supply to the burner and the closed o-'r .partially closed position of the valve will b'e maintained until the temperature of the ammonia gas passing thrbugh the pipe 44 has fallen below the aforesaid certain' temperature,

whereupon the lever 103 will descend thus' movingthe fork 104b back into its normal position and the full valve will be returned by the action of the spring-shoe to its open position. The operation of our improved refrigerating apparatus is as follows: Starting with the parts in the position shown in all of the views of the drawings excepting Figs. 8 and 9, the burner 22 is in heating position under the generator-absorber 12; the cooling water nozzle 2Oa is in a position to direct the cooling water upon the' inclined bottom 19b oiMthe compartment of the box 19 which is located above the rgeneratorabsorber 13; the water-trough 26 to the left of the burner 22 is under the generator-absorber 13, while 'the other trough 26 is in a position to the Fig. 4, is 'engaged against the right-hand shoulder 81 of the arcuate plate 82 carried by the rock-shaft pipe 23'of the burner; the lug or dog 98a on the lever 98, which is adapted to be operated by the back lpressure from the generator-absorber, stands in the path of the right-hand stop or shoulder 99 as shown in Fig. 4) of the arcuate plate 82, and all of the diaphragms are in normal p0- sition so that they have no eifect to raise any of the levers which they are intended to operate. The parts remain in this position until the generator-absorber 12 is heated to a temperature (carefully predetermined) corresponding to and indicating the presence in said generator-absorber of the Weakness of liquor contained therein at which the apparatus is intended to Work. lVhen this temperature is reached, the Water or other fluid in the pipe in said generatorabsorber` will, by its boiling and expansion, induce suflicient pressure in the associated diaphragu'i chamber 76, to raise the long arm ofthe lever 78, notwithstanding the associated Weight 87, and with it the connected lever 8O and thus lift the dog or lug engaged against the right-hand shoulder 81 on the arcuateV plate 82 so as to release said arcuate plate (see Fig. 8) and permit it and the burner to rotate toward left as shown in Fig. 5. During this time the cooling Water falling on the rectifier pipe above the generator-absorlier 13, and from thence dripping upon the generatorabsorber 13, has been flowing about the sides of said generator-absorber and filling the trough 2G below it, so that when the plate 82 is released as above described. the weight of the Water in said trough 2G causes the burner to shift toward the other generator-absorber 13. In the meantime the liquor in the said generator-absorber 13 that is absorbing has been approaching' the degree of saturation that the apparatus lis designed to work with and the pressure thereon has been gradually rising; but unless it has risen sufliciently to raise the lever 95 connected with the back-pressure diaphragm 93 at the time that the burner is shifted, the lever 98 carrying the dogor lug 98e will normally stand in such position that when the burner is shifted as above described, the right-hand shoulder 99, as seen in Fig. 4, will strike said lug 98n and arrest the movement of the plate 82 and also the burner so that the burner will stand in the position indicated in dotted lines in Fig. 5, and the arcuate plate will stand in the position shown in Fig. 9.

As the burner moves into this position it will swing the lever 21a which is adapted to shift the cooling water nozzle 20a into the position shown in dotted lines in Fig. 5, in which it will still continue to direct cool- ;ing Watery upon the generator-absorber 13.

the right, as shown in Fig. 4l, and to the out of the path of the shoulder 99 on the arcuate plate 82, and 'the Weight of the Water still retained in the trough 26 under the generator-absorber 13, will cause the lourner` to shift from its intermediate position to heating position below the generator-absorber 13. In this shifting of the burner, the trough 26 Will be brought to such a position as to discharge the Water that remains in it so that it will no longer affect the operation of the burner by its Weight.

Upon the arcuate plate 83 reaching the right-hand limit of its movement (as appears in Fig. 41) the lug 80? on the left-hand lever 80 associated with the generator-absorber 13, will drop into position to engage against the left-hand shoulder 81 o? said arcuate plate so as to resist a return movt ment of said plate and therefore of the burner and the lug 98 of the lever 98 will fall into a position in the path of the lefthand shoulder 99 of said arcuate plate, so as to again arrest the shifting of the burner in case the predetermined temperature in the generator-absorber which is being heated is reached, vbefore the Apredetermined pressure in the generator-absorber which is absorbing is reached. The second cycle then proceeds as the lirst, the generatoralisorher 1'3 being now heated and the generator-absorber 12 being sii'nultaneously cooled until the contents of the first have been heated to the predetermined temperature, whereupon the burner is shifted into its intermediate position at which it is held until the predetermined back pressure has been reached in the generator-absorber 12. The burner is then shifted to heating position under said generator-absorber 12 and the cooling Water is directed to fall upon the generator-absorber 13, the position first described.

During the time that either generatorabsorber is'being heated and the burner 22 is in heating position below the same and also when said burner is in its intermediate position adjacent said generator-absorber and burning at pilot flame (when it is immediately below the thermostatic pipe 71 adjacent said generator-absorber, as appears in Fig. 5) the said thermostatic pipe 71 is being heated and the associated diaphragm 60, that control the positively acting checkvalves 48 and 42 interposed respectively in the discharge conduit of the adjacent generator which is absorbing and in its own Cif return conduit, are expanded so as to hold the balls of said check-valves rigidly closed on their seats. This positivelyprevents the liovv of ammonia gas in the Wrong direction, that is to say, prevents the flow of the generated ammonia gas into the drum Which is absorbing and prevents the escape of fluid from the drum which is generating into the return system. The fact that said checkvalves are closed in this Way and also their construction as heretofore described is important since While a piece of scale or other extraneous matter might fall on the seat and prevent the proper closing of the other check-valves, the pressure on the balls of the positively acting check-valves, together With their knife-edge case-hardened seats, breaks the scale or cuts it so that it is dislodged from the seat and the ball is permitted to properly close.

We prefer to provide a ball valve 91a' (see Fig. 18) and a seat 91b above it in the casing 187 leading tothe back pressure diaphragm casing 91, so that if the diaphragm 93 is ruptured by reason of undue back pressure or for any other reason, said ball-valve by the rush of escaping ammonia gas will be closed upon its seat and the further escape of ammonia be thus prevented, Means is provided as shown to normally support the ball 91L in a position closely adjacent to its seat.

le claim as our invention l. ln a refrigerating apparatus, the combination with a generator-absorber, of a discharge conduit therefor anda return conduit, means for cooling and heating said generator-absorber in alternation, a valve located in the discharge conduit, and thermostatic means for positively closing the valve in the discharge conduit during the period of absorption.

ln a refrigerating apparatus, the combination with a generator-absorber, of'a dis-l charge conduit therefor' and a return conduit, means for cooling and heating said generator-absorber in alternation, a valve located in the return conduit, and thermostatic means for positively closing the valve in the return conduit during the period of generation.

In refrigerating apparatus of the absorption type, including generator-absorbers arranged in pairs, means providing clischarge conduits for leading the generated fluid from each of said generator-absorbers, means providing return conduits for leading the expanded refrigerant back to each of the generator-absorbers, means for cooling and heating said generator-absorbers in alternation, valves in each of said conduits, and means operated by the heat means and connected with each of said valves to positively hold closed the valve in the return conduit olf the generator-absorber which is being heated, and the valve in'the discharge conduit of the generator-absorber Whichis being cooled until the: heating means is applied to the generator-absorber that is being cooled.

i t.v ln a .refrigerating apparatus of the absorption type, including generator-absorbers arranged in pairs, means providing discharge conduits for leading the generated fluid from each of said generator-absorbers, means providing return conduits for leading the eXpanded fluid back to each of the generator-absorbers, means for cooling and heating said generator-absorbers in alternation including a burner member adapted to supply heat to either' of said generator-absorbers, said burner member being movable from heating position under one generatorabsorber to heating position under the other generatorabsorber, check valves provided in each of said conduits adapted to prevent a bacl flow of fluid therethrough, movable stop members for each of said check-valves adapted to hold them against opening movement, and thermostatic actuating means associated with said stop members adapted to bring the stop member of the check-valve in the return conduit of the generator-absorber which is being heated and the stop member of the check-valve in the discharge conduit of the generator-absorber Which is being cooled into operative position and to retain it there until the burner is shifted to heating position below the generator-absorber that is being cooled.

5. ln a refrigerating apparatus of the absorption type, the combination of a`pair of generator-absorbers, discharge and return conduits for each generator-absorber, means lfor cooling and heating said generator-absorbers in alternation including a burner member adapted to supplyheat to either of said generator-absorbers, means for moving the burner member from heating position adjacent one absorber to heating position adjacent the other, means for stopping the burner in its movement from one generatorabsorber to the other, a valve for controlling the supply of fuel to said burner, means acting on said valve and operated by a move,- ment of the burner to diminish the supply of fuel When the burner is in an intermediate position, valves in each of said conduits, means for positively closing said valves, and thermostatic means operating the closing -means and having members adapted to be heated by the burner Whereby tho closing of the valves is dependent upon the position of the burner.

6. ln a refrigerating apparatus of the class described, including generator-absorbers arranged in pairs, means providing conduits for leading the generated fluid from each of said generator-absorbers, and means providing. return conduits for leading the viding conduits for leading the generated fluid from each of said generator-absorbers, said means in each case including a rectifier pipe rising from one generatorabsorber, ci ossing over toa point in a vertical plane above the other generator-absorber and extending in an upwardly inclined direction in saidvertical plane, and means for, cooling said generator-absorbers in alternation, 'said means' being adapted to direct the cooling medium upon the upwardly inclined part of said rectifier pipe in its passage to the generator-absorber to be cooled.

8. In an automatic refrigerating apparatus 'of the absorption" type, including generator-absorbers arranged in pairs, means providing discharge conduits for leading the generated fluid from each of said generator absorbers, means providing return conduits for lea-ding the expanded fluid back to each of the generator -absorbers, means for cooling and heating said generatorabsorbers alternation,- valves in each of -said .'conduits and means dependent `for its operation on the heating means, and connected with each of said valves, adapted to close the valve in the return conduit of the generatorabsorber which is being heated and to close the valve in the generator-absorber which is being. cooled, until the heating means is shifted to the generator-absorber thatwas being cooled.,

9. In an automatic refrigerating apparatus of the absorptionv type, including generator-absorbers arranged in pairs,means providing discharge conduits for leading the generated fluid `from each of said\gen erator-absorbers, means providing return conduits for leading the expanded fluid ck to each of the generator-absorbers, means for coolingand heating said 'gener- :ttor-,absorbers in alternation including a burner member ,adapted to supply heat to i either of said generator-absorbers, said burner-member being movable from heating position under one generator-absorber to heating position under the other generator-- absorber, check-devices provided in each ol said conduits adapted to prevent a back flow of fluid therethrough, positively acting closing devices for each of said check-devices holding them against opening movegenerator-absorbers means for cooling and heating said generator-absorbers in alternation including a burner member adapted tossupply heat to either of said generator absorbers, means for moving said burner member from heating position under one generatorabsorber to heating position under the other generatorabsorber, means for staying the,l movement of said burner member at an intermediate position in its path from one generatorabsorber to the other, a valve for controlling lthe supply of fuel to said burner, means acting on the valve for diminishing the supply of fuel when said burner is in an intermediate position, check-valves provided in each of said conduits adapted to prevent a back flow of fluid therethrough, positively acting closing devices for each check-valve for holding them against opening movement, and thermostatic means including'a member located adjacent each generator-absorber adjacent the point in the path of the `burner where said burner is adapted `to be stayed. for operating each closing device to hold rigidly against its seatthe check-valve in the return conduit of the 'generator-'abv sorber which i's being heated, and the checkvalve of the generator-absorber which is b eingcooled until the burner is shifted to heating position under the other generatorabsorber that has been cooled.

11. In an automatic refrigerating ap paratus of the class described, including arranged in pairs, means providing conduits for leading the generated fiuid from each of said generator-absorbers, and means providing return conduits for leading the expanded fluid back to each of the generator-absorbers,

` check-valve devices located in each of said discharge conduits and return conduits to prevent a back flow of fluid through said colrduits, and means for positively locking each check-valve in closed position against thel back flow of fluid during the time'that a forward flow of fluid is taking place in the check-valve in the associated conduit.

12. In a refrigerating apparatus of the absorption type, the combinationof a pair of generator-absorbers, dischargeand. return conduits for each generator-absorber, means for heating said generator-absorbers in alternation comprising a movable heating menriaeg'ffand.. means for moving it from heating position adjacent one generator-absorber to heating position adjacent the other, means for bringing cooling fluid to each generator-absorber in alternation, means for controlling the last named means by the heating member, a pair of receptacles each adapted to catch cooling fluid When one of the generator-absorbers is being cooled, means carrying said receptacles and connected *with the heating member, means for holding the receptacles in their receivingr positions respectively, thereby bringing the heating member adjacent the opposite generator-absorber, and means controlled by the conditions in the generator-absorber for releasing said holding mi ans to allow the Weight of the Water in th.,I receptacle in the receiving position to shift the burner by moving the receptacles.

13.1n an automatic refrigerating apparatus of the kind described including generatorabsorbers arranged in pairs, means for heating said generator-absorbers in alternation comprising a burner adapted to shift from heating position under one generator-absorber to heating position under the other generator-absorber, means for staying the position of said burner at a point intermediate its heating positions under said generator-absorbers, a valve for supplying fuel to said burner, automatic means for closing said valve When said burner leaves the heating position under either generator-absorber and means for supplying continuously `a limited amount of fuel to said burner.

14. In an automatic refrigerating apparatus of the absorption type, including generator-absorbers arranged in pairs, means providing conduits leading the generated fluid from each of the generator-absorbers, and means providing return conduits for leading the expanded fluid back to each of the generator-absorbers, means for heating the generator-absorbers in alternation consisting of a burner member adapted to be shifted from heating position under one generator-absorber to heating position under the other generator-absorber, an arcuate plate made rigid With said burner and provided With oppositely facing shoulders, stop devices associated with each generator-absorber adapted to engage said shoulders When the burner is in heating position under the associated generator-absorber, and thermostatic devices, one associated with each generator-absorber, adapted for raising said stop devices from the path of saidv shoulders When said generatorabsorbers have been raised to a predetermined temperature, and means for shifting said burner when said stop devices have released said shoulders.

15. ln a refrigerating apparatus of the absorption type, the combination of a pair of generator-absorbers adapted to be heated in alternation, means for supplying a cooling agent, a shiftable burner adapted to heat each of the generator-absorbers, receptacles connected with the burner, shiftable means for controlling the cooling agent, means for holding the receptacles in position While they ill With Water, and means for releasing the holding means whereby the Weight of Water in one of the receptacles will canse a movement of the burner and shifting means vcontrolling the cooling agent.

16. ln a refrigerating apparatus, the combination with a generator-absorber, of a discharge conduit therefor, a return conduit, means for heating and cooling Said generator-absorber in alternation, valves located in each of said conduits, and thermostatically controlled means acting positively to seat the valves in the conduiits, the last named means being operated by the heating means.

In testimony, that We claim the foregoing as our invention, We aiiix our signatures in the presence of two Witnesses, HARRISON H. SoU'rHWonTH at Cleveland, Ohio, this 4th day of October, A. D. 1912, and FRED W. WOLF, at Chicago, llinois, this 21st day 0f October, A. D. 1912.

HARRISON H. SOUTHWORTH. FRED W. WOLF.

Vitnesses to the signature of Harrison H. Southworth 

